linux-kernel - Re: [PATCH] b44: power down PHY when interface down

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Message-ID: <46866C6B.9010801@linux.intel.com>
Date:	Sat, 30 Jun 2007 07:44:59 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Török Edvin <edwintorok@...il.com>,
	netdev@...r.kernel.org, power@...host.org, zambrano@...adcom.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] b44: power down PHY when interface down

Matthew Garrett wrote:
> On Sat, Jun 30, 2007 at 02:47:35PM +0300, Török Edvin wrote:
>> When the interface is down (or driver removed), the BroadCom 44xx card 
>> remains
>> powered on, and both its MAC and PHY is using up power.
>> This patch makes the driver issue a MAC_CTRL_PHY_PDOWN when the interface
>> is halted, and does a partial chip reset turns off the activity LEDs too.
> 
> Do you still get link beat detection when the phy is powered down?
> 
does that matter?
If the interface is down, nic drivers aren't expected to detect 
link... if userspace wants to find link status it should have the 
interface up.
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